الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The involvment of viruses in the Pathogenesis of Malignancies is one of the major fields of research. the lymphotropic viruses: Epstein-Barr virus (EBV),Human Herpes virus-6 (HHV-6), and Human T-lymphoma/Leuxemia virus (HTLV-1) have some roles in the pathogenesis of diverse types of neoplasms. EBV is constantly associated with nasopharyngeal carcinoma (NPC), some other epithelial malignancies, and African Burkitt`s lymphoma. the association of EBV with Burkitt`s lymphoma in non-endemic areas is less than 20%.